.disBtn,.addBtn{
    display: inline-block;
    width: 30px;
    height: 30px;
    text-align: center;
    line-height: 30px;
    border-radius: 50%;
    color:#fff;
    font-size: 20px;
}
.disBtn{
    background: red;
}

.addBtn{
    background: blue;
}